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    "购物车程序项目：\n",
    "\n",
    "要求：1、运行程序后，让用户输入支付宝余额，然后打印我们的商品列表给用户。\n",
    "\n",
    "　　   2、让用户输入商品编号进行商品的购买。\n",
    "\n",
    "　　   3、用户选择商品后，检查用户的余额是否够，若够则直接扣款，不够则提醒用户。\n",
    "\n",
    "　　   4、用户可以随时退出购买，推出时打印用户已购买的商品和支付宝余额。\n",
    "     \n",
    "     \n",
    "     自动保存：ctrl s"
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    "# 商品的数据信息\n",
    "goods_list = [\n",
    "    # [商品名称，商品价格],\n",
    "    ['珍珠奶茶',7],    #每个数据是通过逗号隔开，重点观察逗号所在\n",
    "    ['大杯珍珠奶茶',8.5],\n",
    "    ['加大杯珍珠奶茶',9.5],\n",
    "    ['桶装珍珠奶茶',20]\n",
    "]\n",
    "user_shopping_car = [\n",
    "    \n",
    "]\n",
    "\n",
    "# 用户输入 使用input，input的使用，结果是一个字符串\n",
    "Alipay = input(\"请输入您的余额：\")\n",
    "\n",
    "\n",
    "#选中全部 按tap键可以全部向右一格\n",
    "while True:\n",
    "    # 循环遍历商品列表，将商品信息按照一定格式输出\n",
    "    # 一定格式： 商品编号 ：xx，商品名称：xx，商品价格：xx\n",
    "    print(\"-----请选择商品编号 欢迎选购------\")\n",
    "    for i in range(len(goods_list)): # range会根据商品列表的长度变化而变化\n",
    "        print(\"商品编号：%s ,商品名称：%s ,商品价格：%s\" %(i,goods_list[i][0],goods_list[i][1]))\n",
    "\n",
    "\n",
    "    # 1.让用户输入商品编号进行商品的购买\n",
    "    # 2.用户输入的内容是否符合规范（用户买的东西有没有）？\n",
    "\n",
    "    # 思考：用户除了输入数值外，有没有可能输入不是数值\n",
    "\n",
    "    choice = input(\"请正确输入购买商品的编号：\")\n",
    "    if choice.isdigit():  # isdigit 判断字符串里面的内容是否是数值\n",
    "        choice = int(choice)\n",
    "        if choice > len(goods_list):\n",
    "        # b. 如果没有该商品，返回没有\n",
    "         print(\"您选择的商品不存在\")\n",
    "        else:\n",
    "        # a.如果有 判断金额是否够：用户金额 Alipay  商品的金额 goods_list[choice][1]\n",
    "            if Alipay > goods_list[choice][1]:\n",
    "            # 用户金额够  1.增加该商品到用户购物车  2.扣除金额\n",
    "             user_shopping_car.append(goods_list[choice])\n",
    "            Alipay = Alipay - goods_list[choice][1]\n",
    "            print(\"【%s】已经加入您的购物车，您的账户余额还有：%s元\"%(goods_list[choice][0],Alipay))\n",
    "            else:\n",
    "                print(\"您的余额不够，请更换支付方式\")\n",
    "    elif choice == \"q\":\n",
    "        # 用户退出购买\n",
    "        print(\"用户购物车：\",user_shopping_car)\n",
    "        print(\"您的余额还有：\"，Alipay)\n",
    "        break\n",
    "    else:\n",
    "        print(\"请输入商品编号！！！\")\n",
    "\n",
    "              \n",
    "              \n",
    "#课后优化：\n",
    "#1.如何一次性打印相同的商品  2.更简洁明了的排列方式  3.用户怎么知道输入q退出\n"
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